Plaster-board



Q. L. ROUT T AND G. C. McC ONNELL.

PLASTER BOARD.

APPLICATION FILED NOV. 19, 1917.

1,332,550. Patented June 21, 1921.

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UNITED 1,,s TArEs;

PATENT OFFICE.

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ASS IGNORS TO PLAS'IOID-PRODUCTS, CORPORATION OI CALIFORNIA.

INC., 0! LOS ANGELES, CALIFORNIA, A.

" PLASTER-BOABD.

To all whom it may concern:

Be it known that'we, ORVILLE L. Room and Gnovnn C. MoCoNNELL, citizensof the. United States, residing in the city of Los An eles, county of Los Angeles, and State of alifornia, have invented certain new and useful Improvements in Plaster-Board, of which the following is a specification.

-Our invention relates to plaster board, and more particularly to an improved plaster board made of plastic" materials, molded with holdin means formed as an integral part thereo and it has as its principal object to provide a plaster board of the character referred to which will be light in weight, fire and moisture resisting, and. economical to manufacture.

We have discovered that a plaster board can be made with an inner body or core, composed of a mixture of li ht fibrous, or comminuted substances and eihcient cementitious -matter to serve as a binder, with a coating or layer of plastic matter applied to one or both sides thereof to give surface thereto, thus constituting a real improvement in the art and providing a plaster board which is not. only light and durable, but which can be made or molded with holdfer laster.

ing means, formed as an integral part thereof, for receiving and holding the plastering material applied thereto.

So far as we know, we are the first to provide a plaster board formed of a light,

fibrous or comminuted matter, and a sufficient amount of cementitious substance to bind it together, and which can be rolled and -molded into form, with surfaces formed of a plastic matter, and preferably covered'with paper, and which plaster board has formed. as a part thereof holding means for holding plaster applied to the surface thereof.

, In o'rd'erto more clearly explain our invention, we have illustrated on the accompanying sheet of drawings a practical embodiment thereof, which we will now describe.

i board embodying Figure 1 is a perspective view of a plaster our invention, with a part turned back an a part torifiofi to better show the construction thereof;

Figs. 2 and 3 show slight modifications of p T the formin which ourplaster board can be made.

In the manufacture, of our -improved Specification of Letters Patent. Patented J 21 Application flied November 19, 1917. Serial No. 203,040.

plaster board, the bodythereof, designated 1,

is made of light fibrous -or comminuted matter, such, for example, as kieselguhr, sawdust and the like, with a sufiicient eementitious substance, such as calcined mixed therewith to form a binder therefor, and covered with paper, 2, which is secured thereto by means of a coating or thin layer, 3, of calcined gypsum plaster, or the like. Th1s not only1 tenaciously adheres to the paper, but to t e inner body as well, forming a binder therefor and also giving a surface, which. can be made smooth where a-smooth surface is desired.

As shown in the drawings, we also form or mold our improved plaster board with psum' plaster,

holding grooves or channels having restricted openings, .as'at 4, 4, the paper surface also covering the inside of said holdin grooves. These grooves ma be made in di ferent forms, as shown in ig. 2, in which the groove is rounded, but with a restricted opening, or as shown in Fig. 3, in which the groove is elongated in the plane of the body, but with a restricted opening. The overhanging ortion of the surface body, at the edge of t e channelforms a holding means e have also illustrated, on Fig. 1, as at 5 and 6, how the paper covering 2, on the side which is adapted to receive the plasterasv ing material, can-be provided with holes,

embodied in other forms, and that different materials can be used, and we do not,*therefore, limit our invention, except as we may be limited by the hereto appended claim.

.We claim:

An article of manufacture comprising a plaster board formed of plastic material with a' series of continuous channels therein, said channels having overhanging side walls forming restricted longitudinalpand. uninterrupted openings into said channels, and a continuous paper covering conformin to the inner surfaces of the channels, sai paper covering extendin 'over the board between the channels an into the channels and wholly covering the bottom and overhanging side walls thereof, the paper covering county, California, this 8th day of Novemadhering to the board as a part thereof and ber, 1917 i serving to reinforce the same at its channel """ORVILLE L. ROUTT. portions,- said reinforced channels consti- GROVER C. MCCONNELL. 5 tuting means for holding plaster on the outer In presence of face of the board, substantially as described. D. P. KENDRICK,

Signed at Los Angeles, Los Angeles W. R. LITZENBERG. 

